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All pages importing it have already been migrated to $i18n{}, so these
dependencies don't seem needed anymore.

This changes following pages:
* chrome://media-router
* chrome://md-user-manager

R=dpapad@chromium.org

Bug: 677338
Change-Id: I05bcfba71ca1c8446ddfb14335d404bc382fc523
Reviewed-on: https://chromium-review.googlesource.com/c/1425719Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626217}